Sadly she's not mine, just caretaking before she goes to STS for a service. The 1525 was the ships version of the marine chronometer watch but running a 4.19mhz crystal not the 2.4mhz the watch version used, as such it was accurate to 6 seconds a year not the 12 seconds of the wrist watch!
Amazing piece of kit but sadly didn't really see that much service as it was soon surpassed by technology like gps
They were made specifically for the french navy but also sold to the civilian market too!
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